A study found that ChatGPT-4 outperformed doctors in diagnosing illnesses from case reports, scoring 90% accuracy compared to 76% for doctors using the chatbot and 74% for those without it. Surprisingly, doctors often stuck to their initial diagnoses even when the chatbot offered better alternatives. The research highlights a knowledge gap in effectively leveraging AI for medical decision-making. ChatGPT’s ability to analyze complex cases and explain its reasoning suggests potential as a "doctor extender," providing valuable second opinions and enhancing diagnostic accuracy in healthcare.